html,body{
  height: 100vh;
  overflow: hidden;
}
body{
  margin: 0;
}
h1,h2,h3,h4,ul,p,ol{
  margin: 0;
  padding: 0;
}
li{
  list-style: none;
}
a{
  text-decoration: none;
}
#app{
  height: 100%;
  overflow: hidden;
}